Finding the Fourth Proportional to 105,148.80, 145,107.54 and 57,404.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,148.80 : 145,107.54 = 57,404.16 : x
2. Step 2: Convert to fraction form
   105,148.80/145,107.54 = 57,404.16/x
3. Step 3: Cross multiply
   105,148.80x = 145,107.54 × 57,404.16
4. Step 4: Simplify right side
   105,148.80x = 8,329,776,443.37
5. Step 5: Solve for x
   x = 8,329,776,443.37/105,148.80
6. Step 6: Final answer
   x = 79,218.94